@article{RM_1980_35_5_a11,
     author = {Ho\`ang L\^e Minh},
     title = {The de {Rham} cohomology of weakly irregular differential systems},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {261--262},
     publisher = {mathdoc},
     volume = {35},
     number = {5},
     year = {1980},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1980_35_5_a11/}
}